Summary of Significant Accounting Policies (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of stock options included in calculation	650,000	708,000	650,000	708,000
Number of dilutive shares outstanding	359,000	307,000	335,000	213,000
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of dilutive shares outstanding	78,000	83,000	81,000	83,000
Shares of restricted stock awards included in calculation			147,000	148,000